Design Con 2015

Deloca

's profile
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Designer/Educator

Electronics hobbyist, engineer, physicist. I have lived and worked in quite a few places around the world. Overall, I believe in a united, peaceful and caring humanity since we have one home that connects all of us. Planet Earth.


Deloca

's contributions
  • 10.14.2014
  • Lightning strike becomes EMP weapon
  • The title is a bit misleading. The term "weapon" implies a deliberately directed destructive device through whose agencies opponents may be neutralized or eliminated.
  • 08.11.2014
  • Hybrid vacuum tube/solid-state audio power amplifier
  • There is a school of thought that says amplifiers with vacuum tube front-ends sound markedly different, even mellow - the a benefit of the enhanced thermionic emission. The author implies it also "with very crisp, tightly controlled bass and a natural midrange...". I imagine that kind of sound appeals to many but is hard to replicate solely with transistors.
  • 08.04.2014
  • HB-LED flashing beacon repurposes switching regulator
  • It is not clear exactly how C1 discharges, i.e. through what impedance. The charging of C1 occurs through a constant current source of about 330mA, but for the sake of finding the approximate frequency expression it would be nice to talk a bit more about the discharge mechanism. And referring one to the datasheet of the 34063 isn't cool either. Otherwise an interesting circuit.
  • 07.21.2014
  • Improve efficiency of low-cost switcher
  • That's a neat method to reduce the power dissipation in Q2 that leads to higher output efficiency. What are the considerations for selecting C1 for the general PWM driver that can, for instance, work at several MHz? I think the 34063 works at 100kHz tops.
  • 07.14.2014
  • Variable HV power supply employs photovoltaic optocoupler
  • Nice concept, I have seen such a scheme used for a 48V telecoms line. It would have been really neat to power the converter offline and derive and auxiliary supply for the controller from there as well and eliminate the separate 15V.